Unformatted text preview: neutrons and thus differing in atomic mass. 7. Radioactive tracers may be used in biology and medicine by following atoms through metabolism and/or any other chemical processes in the body like cells making copies of their DNA. Also, the tracers can be used to diagnose certain disorders of organs and blood and they can be used in imaging instruments like PET scanners. 8. An electron shell represents an energy level as the distance of an electron from the nucleus of an atom. 9. Only 2 electrons may be in the first electron shell. 10. Up to 8 electrons may be in the second and subsequent shells. 11. Yes, the electrons are orbiting the nucleus in concentric circles....
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This note was uploaded on 01/26/2010 for the course BIO 1151 taught by Professor Robinson during the Spring '09 term at College of DuPage.
- Spring '09